Exchange-Coupling-Induced Symmetry Breaking in Topological Insulators
Author(s)Wei, Peng; Katmis, Ferhat; Assaf, Badih A.; Steinberg, Hadar; Jarillo-Herrero, Pablo; Heiman, D.; Moodera, Jagadeesh; ... Show more Show less
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An exchange gap in the Dirac surface states of a topological insulator (TI) is necessary for observing the predicted unique features such as the topological magnetoelectric effect as well as to confine Majorana fermions. We experimentally demonstrate proximity-induced ferromagnetism in a TI, combining a ferromagnetic insulator EuS layer with Bi2Se3, without introducing defects. By magnetic and magnetotransport studies, including anomalous Hall effect and magnetoresistance measurements, we show the emergence of a ferromagnetic phase in TI, a step forward in unveiling their exotic properties.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Plasma Science and Fusion Center
Physical Review Letters
American Physical Society
Wei, Peng, Ferhat Katmis, Badih A. Assaf, Hadar Steinberg, Pablo Jarillo-Herrero, Donald Heiman, and Jagadeesh S. Moodera. Exchange-Coupling-Induced Symmetry Breaking in Topological Insulators. Physical Review Letters 110, no. 18 (April 2013). © 2013 American Physical Society.
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